51. Let Q (\(\sqrt\gamma\)) be the BER of a BPSK system over an AWGN channel with two-sided noise power spectral density N0/2. The parameter \(\gamma\) is a function of bit energy and noise power spectral density.  A system with tow independent and identical AWGN channels with noise power spectral density N0/2 is shown in the figure. The BPSK demodulator receives the sum of outputs of both the channels.  

If the BER of this system is \(Q(b\sqrt\gamma)\) then the value of b is _____________.

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